Kalachakra is a Sanskrit word that means “Time wheel”. It refers to one of the most complex philosophies and meditation practices within tantric Buddhism.
It represents a big palace with 5 distinct levels. Every detail of the mandala, from each deity to every adornment of the building, refers to time and the universe (Outer Kalachakra) or physical and mental aspects (Inner Kalachakra) as well as the practice.